States are the seat of most authority for public health emergency response. Much of the actual work of response falls to local officials. However, the federal government can impose requirements upon states as a condition of federal funding. Since 2002, Congress has provided funding to all U.S. states, territories, and the District of Columbia, to enhance federal, state and local preparedness for public health threats in general, and an influenza ("flu") pandemic in particular. States were required to develop pandemic plans as a condition of this funding.